<template>
    <div class="cart-ctrl">
      <transition name="move">
        <div class="cart-decrease" v-show="food.count>0" @click.stop.prevent="decreaseCart">
          <span class="inner icon-remove_circle_outline"></span>
        </div>
      </transition>
      <div class="cart-count" v-show="food.count>0">{{food.count}}</div>
      <div class="cart-increase icon-add_circle" @click.stop.prevent="increaseCart"></div>
    </div>
</template>

<script>
import Vue from 'vue'

export default {
  props: {
    food: {
      type: Object
    }
  },
  methods: {
    increaseCart (event) {
      if (!event._constructed) {
        return
      }
      if (!this.food.count) {
        Vue.set(this.food, 'count', 1)
      } else {
        this.food.count++
      }
      // vue2.0废弃$dispatch,替换成$emit 和$refs
      // 添加这句，提交'add-to-shopping-cart'事件 给 父组件，第二个是要传递的参数
      this.$emit('add-to-shopping-cart', event.target)
    },
    decreaseCart (event) {
      if (!event._constructed) {
        return
      }
      if (this.food.count) {
        this.food.count--
      }
    }
  }
}
</script>

<style lang="stylus" scoped>
.cart-ctrl
  font-size: 0
  .cart-decrease
    display: inline-block
    padding: 6px
    transition: all 0.4s linear
    &.move-enter-active
      opacity: 1
      transform: translate3d(0, 0, 0)
      .inner
        transform: rotate(0)
    &.move-enter, &.move-leave-active, .move-fade-leave-to
      opacity: 0
      transform: translate3d(24px, 0, 0)
      .inner
        transition: rotation(180deg)
    .inner
      display: inline-block
      line-height: 24px
      font-size: 24px
      color: rgb(0, 160, 220)
      transition: all 0.4s linear
  .cart-count
    display: inline-block
    vertical-align: top
    width: 12px
    padding-top: 6px
    line-height: 24px
    text-align: center
    font-size: 10px
    color: rgb(147, 153, 159)
  .cart-increase
    display: inline-block
    padding: 6px
    line-height: 24px
    font-size: 24px
    color: rgb(0, 160, 220)
</style>
